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Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Goodwill [Line Items] |  |
Amortization of Intangible Assets | $ (1.1) |
Finite-Lived Intangible Assets, Accumulated Amortization | 29.5 | $ 28.4
Intangible Assets, Gross (Excluding Goodwill) | $ 34.9 | 34.9
Maximum |  |
Goodwill [Line Items] |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |
Pulp And Paperboard [Member] |  |
Goodwill [Line Items] |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 48.8 | 35.1
Goodwill, Acquired During Period | 13.7 |
Amortization of Intangible Assets | (1.1) |
Intangible Assets, Net (Excluding Goodwill) | 5.4 | $ 6.4
Customer Relationships |  |
Goodwill [Line Items] |  |
Intangible Assets, Net (Excluding Goodwill) | $ 5.4 |

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